Google Earth engine (GEE) -- crop extraction and analysis using sentinel-2 data

We use sentinel data to classify and extract crops , The main useful time nodes are spring, summer, autumn and winter , By threshold method and updateMask To achieve the extraction of crops .

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Code ：

// Load sentry 2 Data no. 
var s2 = ee.ImageCollection("COPERNICUS/S2_HARMONIZED"),
    roi = 
    /* color: #d63000 */
    /* displayProperties: [
      {
        "type": "rectangle"
      }
    ] */
    ee.Geometry.Polygon(
        [[[114.27025202404155, 33.89965438737615],
          [114.27025202404155, 33.27732637743472],
          [115.25352839122905, 33.27732637743472],
          [115.25352839122905, 33.89965438737615]]], null, false);

Map.centerObject(roi)
Map.addLayer(roi)

// Conduct QA60 Cloud removal operation function 
function maskS2clouds(image) {
  var qa = image.select('QA60')
  var cloudBitMask = 1 << 10;
  var cirrusBitMask = 1 << 11;
  var ma